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A fun, free platform for learning modern cryptography

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Learn By Doing

Learn about modern cryptography by solving a series of interactive puzzles and challenges. Get to know the ciphers and protocols that secure the digital world by breaking them.

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Level Up

Earn points by solving challenges. Finish categories to earn trophies and gain levels to track your progress. Can you reach the top of the scoreboard?

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Fresh Challenges

We are constantly creating new challenges to keep your crypto knowledge up to date. Expect exciting brainteasers and whole new categories as the site continues to grow.

New Challenges
RSA or HMAC? Part 2 Crypto on the Web 100
Roll your Own Mathematics 125
Dancing Queen Symmetric Ciphers 120
SSH Keys General 35
LFSR Destroyer Misc 250
Weekly Top Users
#1 Dew 2490
#2 ZM_J 1995
#3 trde 1615
#4 Cib 1605
#5 hoti21 1535
Recent Solves
Base64 victor_mks
Hex victor_mks
You either know, XOR you don't beachnoir
ASCII victor_mks
Great Snakes AinzSama
Recent Solutions
Collider ATERMON 0
Hash Stuffing ATERMON 0
Jack's Birthday Confusion ATERMON 0
Jack's Birthday Hash ATERMON 0
Manyprime pdro 0

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